PubSub: minor fixes
- Publisher scheduler: avoid to use a double buffer when sending data since there is already a double buffer used in the RT Publisher API which is used by scheduler. Thus data is provided by RT Publisher API on each publishing interval already using a double buffer mechanism to guarantee data availability and that new data might be updated at same time.
- RT PubSub API: add documentation
- PubSub tests: fix timing issues
Edited by Vincent Monfort